Spitfire Wheels Formula Four Lock-Ins White / Red Skateboard Wheels - 53mm 101a (Set of 4)
Olliewood Skateshop Luxembourg - Spitfire wheels largely come in two durometers, 99a and 101a. The 99a formula is better suited to street skateboarding. It's a hardness that provides great grip on most
Skateboarding Is My Lifetime Sport: Spitfire Formula Four wheels review
Spitfire F4 Formula 4 101a OG Classic Swirl 52MM Skateboard Wheels - W | THURO
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Mini Logo Skateboard Wheels A-cut "2" 58mm 101A White 4pk - Mini Logo Skateboards